C#

Fsw = new FileSystemWatcher();
          
            Fsw.Path = "c:\\DirListen";
            Fsw.Filter = "*.xls";
            Fsw.Created +=new FileSystemEventHandler(Fsw_Changed);

void  Fsw_Changed(object sender, FileSystemEventArgs e)
{
    try
    {
        Excel.Application oXL;
        Excel._Workbook oWB;
        Excel._Worksheet oSheet;
        oXL = new Excel.Application();
        oWB = oXL.Workbooks.Open(e.FullPath, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
        object opc = Type.Missing;
        oSheet = (Excel._Worksheet)oWB.Sheets.get_Item(2);
        oSheet.Activate();
        oSheet.Cells[1, 1] = "change";
        oSheet.Cells[2, 4] = "another change";
        oXL.Visible = true;
      	oSheet.PrintOut(1, 2, 1, false, "printer", true, false, Type.Missing);
        FileStream fs2 = null;
        StreamWriter sw2 = null;
       oWB.Close(false, e.FullPath, Type.Missing);
       
        oXL.Quit();
        foreach (Process p in Process.GetProcessesByName("EXCEL"))
        {
            p.Kill();
        }
    }
    catch (Exception ex)
    {
        FileStream fs = null;
        StreamWriter sw = null;
            fs = new FileStream("c:\\error.log", FileMode.CreateNew, FileAccess.Write);
            sw = new StreamWriter(fs);
            sw.WriteLine(ex.ToString());
    }
}

elevationSeries.AxisGroup = XlAxisGroup.xlSecondary;
elevationSeries.Values = xlWorkSheet.get_Range ("C2", "C20");
elevationSeries.XValues = xlWorkSheet.getRange ("A2", "A20");
elevationSeries.Name = "Elevation";

Axis yAxis;

yAxis = (Excel.Axis)chartpage.Axes(Excel.XlAxisType.xlValues, Excel.XlAxisGroup.xlSecondary;
yAxis.HasTitle = true;
yAxis.AxisTitle.Text = "Elevation";

// my employee class
  public class Employee
    {
        int id;
        string name;

        public int Id
        {
            get { return id; }
            set { id = value; }
        }

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public void Show()
        {
            Console.WriteLine("Employee ID is " + Id);
            Console.WriteLine("Employee name is " + Name);
        }
    }

// the Serialize
static void Main(string[] args)
        {
           
           Employee[] emp = new Employee[3];

            emp[0] = new Employee();
            emp[0].Id = 10;
            emp[0].Name = "x";

            emp[1] = new Employee();
            emp[1].Id = 20;
            emp[1].Name = "y";

            emp[2] = new Employee();
            emp[2].Id = 30;
            emp[2].Name = "x";

            FileStream fs = new FileStream("123.txt", FileMode.Create);

            XmlSerializer xs = new XmlSerializer(typeof(Employee[]));
            xs.Serialize(fs, emp);

            fs.Close();
        }

// the Deserialize
 static void Main(string[] args)
        {
           
            Employee[] emp = new Employee[3];

            FileStream fs = new FileStream("123.txt", FileMode.Open);
            XmlSerializer[] xs = new XmlSerializer[3];

            for (int i = 0; i < emp.Length; i++)
            {
                xs[i] = new XmlSerializer(typeof(Employee));
                emp[i] = new Employee();
                emp[i] = (Employee)xs[i].Deserialize(fs);
                emp[i].Show();
            }
}